Ramp Metering Jeremy Dilmore, P.E. FDOT District Five TSM&O - - PowerPoint PPT Presentation

`

Ramp Metering

Jeremy Dilmore, P.E. FDOT District Five – TSM&O Engineer

Ramp Signaling in FL

• CO –RSS Warrant Study (2012); TSM&O Strategic Plan (2013);

RSS Implementation Guide (2017);

• D4 - I-95 Managed Lane Phase 3 (54 RS)
• Phase 3A (29 RS)– design/construction, Operation 2019
• Phase 3B (15 RS)– design, Operation 2023
• Phase 3C (10 RS)– Procurement, Operation 2024
• D5 - I-4 Managed Lanes (11 RS) - under construction, Operation 2021
• D6 - I-95 Managed Lane Phase 1 (22 RS) - Operation since 2009

SR-826 Managed Lanes (19 RS) – construction, Operation 2019

• D7 - TBX is evaluating RSS feasibility
• FTE – Completed evaluation and future deployment

2

Why Ramp Meters

Introduction

Ramp Metering

• Red/Green traffic signals at

freeway on-ramps

• Control the rate at which

vehicles enter the freeway

• Regulate traffic flow

Benefits

• Reduce Crashes
• Break up Platoons
• Divert Traffic
• Increase Vehicle Throughput
• Cost-Effective

https://www.fdot.gov/traffic/Ramp-Signaling 1

RSS Design - Component

• Controller
• Signal
• Detectors
• Cabinet
• Flashers
• Signing
• CCTV
• TMC
• Power
• Communication

3

RSS Design – Detectors

• Freeway Detection
• Upstream detector – MVDS, configurable, existing or new
• Downstream detector – MVDS, configurable, existing or

new, depending on bottleneck locations

• Mainline – MVDS, immediate downstream of gore, fed to

controller directly

• Ramp Detection
• Demand – typically loop, presence detection
• Passage – typically loop, presence detection
• Queue loop – typically dual loops, queue detection
• < 50 ft from intersection, if ramp <1320 ft,
• < 1200 ft from signal ,if ramp > 1320 ft
• Intermediate Loop - Optional

4

RSS Design – Stop Bar and Regulatory Signs

• Stop Bar – must be properly located
• Meet acceleration length requirement
• Provide adequate storage on ramp
• Stop Bar Sign
• R10-6x
• Post mounted on signal pole
• X Vehicles Per Green
• R10-28/R10-29
• Flow control strategy determined by ramp

volume analysis

• Post mounted adjacent to signal pole

5

RTMC Readiness

• Software development acquisition
• Hardware Acquisition
• SOG Development
• Operations Staff Training
• Maintenance Staff Training
• Workstation Configuration & Setup

6

RSS Operation – Operation Mode

Pre-Timed Traffic Responsive Local

• No real-time data is needed
• Requires periodic manual update
• Appropriate for localized issues
• Less effective for non-static conditions
• Vehicle detection is needed
• Appropriate for localized issues
• Higher capital and maintenance costs

than pre-timed systems

• Greater benefits

System-Wide

• Appropriate for widespread issues
• Vehicle detection is not needed
• Rarely used, as compared to system-wide

traffic responsive systems

• Vehicle detection is needed
• Appropriate for localized issues
• Most useful for corridor, system-wide

applications

• Greatest capital and maintenance costs,

but yields most benefits 7

RSS Operation – D5 Operations Plan

• We have watched D6;

going to observe D4

• Fully Automated Activation &

Deactivation Process

• Traffic Data Triggered
• SunGuide Event Creation Triggered
• ICMS refinement
• Operators to observe critical

intersections

• Michigan Ave / Kaley St
• South St
• John Young Pkwy

Incident Management

• Existing Incident Management resources will be sufficient to cover

metered ramps

• Coordinate with FHP
• Initial DEPLOYMENT /ACTIVATION enforcement saturation
• Periodic FHP targeted metered ramp enforcement
• (District 6 methodology)

9

`

For more information: www.CFLSmartRoads.com

Jeremy Dilmore, P.E. FDOT District Five – TSM&O Engineer Jeremy.Dilmore@dot.state.fl.us (386) 943-5360